There's nothing more frustrating than being put on hold - but did you know many call centre workers can still hear EVERYTHING you say?

That's right, in many companies the calls are recorded "from start to finish", meaning that any frustrated effing and blinding is also caught on tape.

While those working in the call centre can also hear your on-hold complaints, which could make them more likely to dodge your call, according to reports.

TrouserNagini said: "When I put somebody on hold... I can still hear them as clear as I ever have done.

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"My phone records what they are saying at all times, it never records hold music.

"I often hear people moaning / b****ing about the company but I much prefer listening to when they are having conversations to their partners etc whilst thinking I can't hear a word, muahaha".

While rumrunnrx, a customer, added: "I found out the hard way companies have a 'cool down period' they can and will enforce if a customer is too loud during hold, whether on hold during a call or waiting to be served. I was mad."

According to Mike Schrider, the president of a call monitoring service who spoke to New York Times, those playing the recorded tapes back often hear couples arguing and parents shouting at their kids.

He joked: "You could have a show on Broadway just playing the calls," adding that two per cent of recorded calls are listened to.